Graphene/polymer heterostructure-based flexible and biocompatible pressure/strain sensor
AssigneeClemson University
InventorsSoaram Kim, Goutam Koley, Yongchang Dong, Apparao M. Rao
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Abstract
Pressure/strain piezoresistive are described that include a poled piezoelectric polymer such as PVDF or P(VDF-TrFE) and graphene. The poled piezoelectric polymer and the graphene are electronically coupled to form a heterojunction and provide an ultra-high sensitivity pressure/strain sensor. The sensors can be carried on a flexible supporting substrate such as PDMS or PET to exhibit high flexibility. The materials of formation can be biocompatible and the sensors can be wearable or implantable.
Claims19
A piezoresistive strain sensor comprising:
- a first layer including a poled piezoelectric polymer;
- a second layer comprising graphene;
- a first electrode between the first layer and the second layer;
- a second electrode, the first layer separating the first electrode and the second electrode;
- wherein
- the first and second layers are in electrical communication with one another such that the piezoelectric polymer and the graphene form a heterojunction.
A method for forming a piezoresistive sensor comprising
- locating a first layer adjacent to a second layer, the first layer comprising a piezoelectric polymer and the second layer comprising graphene, the first and second layers being located such that the piezoelectric polymer and the graphene are in electrical communication with one another and form a heterojunction;
- locating a first electrode between the first layer and the second layer;
- locating a second electrode adjacent the first layer such that the first layer separates the first electrode and the second electrode;
- and
- poling the piezoelectric polymer.
Dependencies are inferred from the claim text.